diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/popen.cpp b/compiler-rt/test/sanitizer_common/TestCases/Posix/popen.cpp
index 6bf6255a697a..1cc7908086c6 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/popen.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/popen.cpp
@@ -2,6 +2,8 @@
 // CHECK: 1
 // CHECK-NEXT: 2
 
+// XFAIL: iossim
+
 #include <assert.h>
 #include <stdio.h>